CN110885415B

CN110885415B - Antistatic and antibacterial polyacetal resin and preparation method thereof

Info

Publication number: CN110885415B
Application number: CN201911199223.4A
Authority: CN
Inventors: 徐一麟; 陆亦军; 苗春萌; 王大林; 刘彪; 陈海波
Original assignee: Wanhua Chemical Group Co Ltd
Current assignee: Wanhua Chemical Group Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2023-01-13
Anticipated expiration: 2039-11-29
Also published as: CN110885415A

Abstract

The invention provides an antistatic and antibacterial polyacetal resin and a preparation method thereof. The thiophene compound is a thiophene compound containing epoxy groups. The reactive compatilizer is diisocyanate. The preparation method of the polyacetal resin comprises the steps of uniformly mixing the polyacetal and the auxiliary agent, and mixing and reacting the mixture, the thiophene compound and the reactive compatilizer. According to the invention, the thiophene polymer, the diisocyanate reaction type compatilizer and other additives are reacted with the polyacetal resin for extrusion, so that the antistatic property, the antibacterial property and the thermal stability of the polyacetal resin are effectively improved, and the polyacetal resin can be widely applied to modification of the polyacetal resin.

Description

Antistatic and antibacterial polyacetal resin and preparation method thereof

Technical Field

The invention relates to a polyacetal resin, in particular to an antistatic and antibacterial polyacetal resin and a preparation method thereof, belonging to the technical field of high polymer materials.

Background

Polyacetal is an engineering plastic with excellent comprehensive performance, and is commonly used for manufacturing transmission parts such as gears, slide rails and the like. The transmission member is liable to charge accumulation, and the polyacetal has a high specific resistance, a good electrical insulation property, and a limited oxygen index of only 15%, and is liable to accidental damage such as fire. In addition, the polyacetal inevitably has unstable hydroxyl terminal during synthesis and processing, and formaldehyde gas is easily generated. Polyacetals are also commonly used as medical materials, which places high demands on their antimicrobial properties. Therefore, it is important to provide a polyacetal resin with excellent antistatic ability and antibacterial property and to improve its thermal stability.

At present, no development of a polyacetal resin having both antistatic and antibacterial properties has been found. In view of the disadvantages of poor antistatic ability, poor antibacterial property and poor thermal stability of polyacetal resin, the skilled person has developed many improvements to the single performance defect, wherein blending modification of polyacetal is an important means. After the traditional small-molecular surfactant type antistatic agent is blended and modified with polyacetal resin, the mixture is not completely compatible, so that the mixture is easy to migrate from the interior of the resin to the surface, and a good antistatic effect cannot be achieved. An antistatic modification method of polyacetal commonly used in industry is to add antistatic agents such as carbon black, carbon nano tubes, carbon fibers and graphene, and patent CN108070198A discloses a flame-retardant antistatic polyacetal composite material and a preparation method thereof. Patent CN108384180A discloses an antistatic polyacetal resin, which uses ethoxylated alkylamine, ethoxylated laurylamine, glyceryl stearate as antistatic agent, polyolefin grafted maleic anhydride copolymer as compatilizer, and conductive fiber and polytetrafluoroethylene are added at the same time, so as to enhance the antistatic property of polyacetal resin, and at the same time, endow polyacetal resin with good wear resistance, and improve the overall strength of the resin. Patent CN103059502A discloses an antibacterial polyacetal plastic, which is improved in antibacterial activity of polyacetal by simple blending modification of polyacetal and a complex antibacterial agent, but is improved in thermal stability and antistatic property.

At present, the common preparation process of polyacetal is to use trioxymethylene as monomer and dioxolane as comonomer, to carry out polymerization reaction under the initiation of catalyst, and then to carry out inactivation, extrusion and granulation processes to obtain polyacetal resin. However, the polyacetal has extremely high specific resistance due to its special C-O main chain structure, and almost no antibacterial property, and also has unstable hydroxyl terminal inevitably existing during synthesis and processing, so that once molecular chain is broken under the action of heat and oxygen, continuous "zipper-like" demethyl aldehyde reaction is easy to occur, and formaldehyde and formic acid generated by formaldehyde oxidation further promote the thermal decomposition process of the polyacetal, which seriously affects the quality of the polyacetal resin. Therefore, the continuous capture of unstable hydroxyl terminals during modification plays an important role in improving the quality of the polyacetal resin.

Disclosure of Invention

The invention aims to provide an antistatic and antibacterial polyacetal resin and a preparation method thereof. The invention discovers for the first time that the introduction of a thiophene structure into a main chain of a polyacetal resin can improve the antistatic property of the material and endow the material with antibacterial property; the introduction of the branched chain structure in the polyacetal resin reduces the regularity of the high molecular chain, so that the stacking of the high molecular chain is more irregular, and the intermolecular gap is increased to reduce the dielectric constant; the branched chain containing the terminal of the epoxy structure in the polyacetal resin can be subjected to grafting and crosslinking reaction with the thiophene compound under the action of the diisocyanate reaction type compatilizer, so that the free volume of the polymer material can be increased, and the dielectric constant can be reduced; the diisocyanate-reactive compatibilizer may also effectively trap the polyacetal resin itself or unstable hydroxyl ends generated during processing, enhancing the thermal stability of the resin.

An antistatic and antibacterial polyacetal resin comprises polyacetal, thiophene compounds and a reactive compatilizer; the mass ratio of the polyacetal to the thiophene compound is 2:1 to 100:1, preferably 2:1 to 50:1, more preferably 5:1 to 20:1; the mass ratio of the thiophene compound to the reactive compatilizer is 2:1 to 100:1, preferably 5:1 to 50:1, more preferably 5:1 to 20:1.

the mass ratio of the polyacetal to the thiophene compound is preferably 5:1 to 20:1, i.e., an amount of the thiophene compound added in an amount of 5 to 20% by mass based on the polyacetal.

Furthermore, the thiophene compound is a thiophene compound or a polymer containing epoxy groups; one or more of poly 3, 4-ethylenedioxythiophene (PEDOT), poly (3, 4-ethylenedioxythiophene)/polystyrene sulfonic acid (PEDOT/PSS), and 3, 4-Ethylenedioxythiophene (EDOT) monomers are preferred.

Further, the reactive compatibilizer is a diisocyanate, preferably one or more of 1, 5-Naphthalene Diisocyanate (NDI), hexamethylene Diisocyanate (HDI), hexamethylene diisocyanate trimer, m-xylylene isocyanate (XDI), 4' -dicyclohexylmethane diisocyanate (HMDI), and isophorone diisocyanate (IPDI).

Further, the polyacetal is a functional acetal containing epoxy group branched chains at the molecular chain terminals; the melt flow rate of the functionalized polyacetals under the condition of 190 ℃ and 2.16kg load is 1-50 g/min, and preferably 6-27 g/min.

Further, the functionalized polyacetal is a polyacetal resin containing a branched chain having an epoxy group at the end, which is obtained by using trioxymethylene as a first monomer, dioxolane as a second monomer, pentaerythritol tetraglycidyl ether as a compound having at least three epoxy groups as a third monomer, acetal compounds such as methylal and butyral as a chain transfer agent, and performing a cationic ring-opening polymerization reaction with a boron trifluoride complex or a heteropolyacid catalyst such as phosphotungstic acid or phosphomolybdic acid in a double-shaft kneader, a reaction vessel or a reaction extruder, followed by deactivation, stabilization and extrusion granulation processes.

Further, the polyacetal resin further comprises an auxiliary agent; the auxiliary agent is one or more of an antioxidant, a lubricant, a nucleating agent and a formaldehyde trapping agent.

Further, the nucleating agent is high-viscosity copolyol or homopolyacetal, and the melt flow rate under the condition of 190 ℃ and 2.16kg load is less than or equal to 3g/min. The mass ratio of the nucleating agent to the polyacetal is 50:1 to 10000:1, preferably in an amount of 0.1 to 1% by mass based on the polyacetal.

Further, the antioxidant is preferably a hindered phenol antioxidant, and can be one or more of antioxidant 245, antioxidant 168, antioxidant 1010 and antioxidant 107 6; the lubricant can be stearate such as calcium stearate, sodium stearate, magnesium stearate, etc., or ethylene bis-stearamide, N' -methylene bis-acrylamide, polyethylene glycol; the formaldehyde scavenger may be a formaldehyde-reactive nitrogen compound such as melamine, dicyandiamide.

Further, the mass ratio of the antioxidant to the polyacetal is 50:1 to 10000:1, preferably in an amount of 0.1 to 1% by mass based on the polyacetal; the mass ratio of the lubricant to the polyacetal is 50:1 to 10000:1, preferably in an amount of 0.1 to 1% by mass based on the polyacetal; the mass ratio of the formaldehyde scavenger to the polyacetal is 50:1 to 10000:1, preferably in an amount of 0.1 to 1% by mass based on the polyacetal. The dosage of the auxiliary agent can also be adjusted according to the requirements of actual conditions.

Further, the melt flow rate of the polyacetal resin is 1 to 27g/min, preferably 6 to 10g/min, at 190 ℃ under a load of 2.16 kg.

A preparation method of antistatic and antibacterial polyacetal resin comprises the following steps:

1) Mixing polyacetal and assistant uniformly;

2) And adding the mixture into a melting and mixing device, adding a thiophene compound and a reactive compatilizer before or during the melting and mixing of the resin, and performing reactive extrusion to obtain the polyacetal resin.

Further, the polyacetal is a functionalized polyacetal with a branched chain containing epoxy groups at the molecular chain terminal, and the preparation process of the functionalized polyacetal is as follows: the polyacetal is a functional acetal with a branched chain containing an epoxy group at the molecular chain terminal, and the preparation process of the functional acetal comprises the following steps: mixing a catalyst, a chain transfer agent and a solvent, and then blending the mixture with trioxymethylene, dioxolane and pentaerythritol tetraglycidyl ether to react to prepare the functionalized polyacetal powder: adding the prepared functional acetal powder into triethylamine solution, stirring for inactivation, centrifuging, drying, devolatilizing, extruding and granulating to obtain functional acetal resin;

the catalyst is preferably boron trifluoride, a boron trifluoride complex or a heteropolyacid catalyst; the boron trifluoride complex is preferably one or two of boron trifluoride diethyl etherate complex and boron trifluoride n-butyl etherate complex; the heteropolyacid catalyst is preferably one or more of phosphotungstic acid, phosphomolybdic vanadate and phosphotungstic vanadate;

the chain transfer agent is preferably one or more of methylal, acetal and butyral;

the organic solvent has a cyclic structure or a linear structure, such as: aromatic hydrocarbons such as benzene, toluene, and xylene; aliphatic hydrocarbons such as cyclobutane, cyclopentane, cyclohexane and the like; ethers such as diethyl ether and diethylene glycol dimethyl ether; aliphatic hydrocarbons such as n-hexane, n-heptane, n-octane, n-nonane, and n-decane; halogenated hydrocarbons such as chloroform, dichloromethane, carbon tetrachloride and the like. From the viewpoint of being inexpensive and readily available, aliphatic hydrocarbons are preferred, and one or more of cyclohexane, n-hexane, and n-heptane are more preferred.

Further, the melting and mixing equipment is a double-screw extruder or a double-shaft reactor, wherein the length-diameter ratio of the double-screw extruder is not more than 52, the temperature of each zone is 140-210 ℃, and the vacuum degree of each vacuum zone is not more than 50 mbar.

The invention modifies the polyacetal resin by the thiophene polymer and the diisocyanate reaction type compatilizer, and has the following gain effects:

(1) According to the invention, the thiophene polymer, the diisocyanate reactive compatilizer and other auxiliaries are reacted and extruded with the polyacetal resin, so that the antistatic property, antibacterial property and thermal stability of the polyacetal resin are effectively improved, and the reactive extrusion modified polyacetal resin can be widely applied to modification of the polyacetal resin;

(2) The additive amount is small, the composition is simple, the operation is simple and convenient, and the industrial scale production is facilitated;

(3) The method improves the antistatic property, the antibacterial property and the thermal stability of the polyacetal resin, ensures the excellent mechanical property of the material, and has the tensile stress of more than 60MPa, the bending modulus of more than 2400MPa and the impact strength of a simply supported beam of 5.3kJ/m ² Therefore, the method can be better applied to the fields of machinery, medical treatment and the like.

Detailed Description

The method according to the invention will be further illustrated by the following examples, but the invention is not limited to the examples presented, but also encompasses any other known modification within the scope of the claims, the specific application of the invention is not limited to the examples described, and a person skilled in the art can apply the inventive concept within the scope of the claims.

The raw materials and sources are as follows:

commercially available polyacetals are available from the KEP company under the trade designations: KEP F20-03 with a melt flow rate of 9g/10min at 190 ℃ under a load of 2.16 kg;

3, 4-ethylenedioxythiophene is a product of Meclin corporation, and has a CAS number of 126213-263-5;

poly (3, 4-ethylenedioxythiophene) is available from Maxin corporation under CAS number 126213-51-2;

poly (3, 4-ethylenedioxythiophene)/polystyrene sulfonic acid is a product of Heraeus corporation under the brand number: PH1000, CAS number 155090-83-8;

1, 5-naphthalene diisocyanate is a product of Shanghai Aladdin Biotechnology GmbH with CAS number of 3173-72-6;

isophorone diisocyanate is a product of Shanghai Aladdin Biotechnology Co., ltd, and the CAS number is 4098-71-9;

hexamethylene diisocyanate is a product of Shanghai Aladdin Biotechnology Co., ltd, and the CAS number is 822-06-0;

the hexamethylene diisocyanate trimer is a product of Shanghai Aladdin Biotechnology Co., ltd, and the CAS number is 3779-63-3;

the m-xylylene isocyanate is a product of Shanghai Aladdin Biotechnology GmbH, CAS number 3634-83-1;

4,4' -dicyclohexylmethane diisocyanate is a product of Shanghai Aladdin Biotechnology GmbH with CAS number of 1761-71-3;

the N, N' -methylene-bisacrylamide is a product of Michelin company, and the CAS number is 110-26-9;

the antioxidant 245 is a product of Pasteur company, and the CAS number is 36443-68-2;

calcium stearate is a lubricant, and is a product of Shanghai Aladdin Biochemical technology, inc., with a CAS number of 1259-23-0;

the nucleating agent is a product of Baoli company, and the mark is as follows: duracon U10 having a melt flow rate of 2g/10min at 190 ℃ under a 2.16kg load;

melamine is a formaldehyde scavenger, a product of Shanghai Aladdin Biotechnology, inc., with CAS number 108-78-1.

The performance test method is as follows:

the tensile modulus and the tensile stress are measured according to ISO527 standard;

flexural modulus was determined according to ISO178 standard;

the impact strength of the simply supported beam is measured according to ISO179/1eA standard;

the heat distortion temperature is measured according to ISO075 standard;

melting point is determined according to ISO3146 standard;

the test of the thermal weight loss refers to the enterprise standard, namely the polyacetal resin is placed in a nitrogen atmosphere at 222 ℃ for heat treatment for 45min, and the weight change of the polyacetal resin before and after the test treatment obtains the thermal weight loss rate.

Antibacterial test standard: QB/T2591-2003A & ltantibacterial plastic antibacterial property test method and antibacterial effect & gt. Detection bacteria: escherichia coli (Escherichia coli) ATCC25922, staphylococcus aureus (Staphylococcus aureus) ATCC6538.

The surface/volume resistivity was determined according to the IEC60093 standard.

[ example 1 ]

(1) Preparing functional acetal:

firstly, continuously mixing boron trifluoride butyl ether complex, methylal and cyclohexane at 0.2g/h, 0.25g/h and 10g/h respectively to obtain a mixed solution A; the mixed solution A was continuously supplied at 8g/h to a biaxial continuous polymerization reactor (manufactured by Switzerland List, inc.: diameter: 50mm, aspect ratio = 18), trioxymethylene as the first monomer, dioxolane as the second monomer, and pentaerythritol tetraglycidyl ether as the third monomer were continuously supplied at 4kg/h, 160g/h, and 80g/h to the polymerization reactor, respectively, and a continuous reaction was carried out at 80 ℃ for 10min to obtain a fresh, non-deactivated functionalized polyacetal powder. And (2) putting the functional acetal powder which is not inactivated into 0.3% triethylamine solution, stirring, fully inactivating, centrifugally drying, devolatilizing in a double-screw extruder, extruding and granulating to obtain the functional acetal. The melt flow rate of the functionalized polyacetal prepared by the method is 9g/10min at 190 ℃ under the load condition of 2.16 kg;

(2) Uniformly mixing 100 parts by mass of functionalized polyacetal particles, 0.3 part by mass of antioxidant 245, 0.3 part by mass of nucleating agent, 0.3 part by mass of calcium stearate and 0.3 part by mass of melamine, and putting the mixture into a double-screw extruder for melting and mixing;

(3) Adding 10 parts by mass of EDOT from a feeding port at the middle rear part of an extruder at a section where resin is in a molten state;

(4) NDI with the mass part of 1 part is added from a feeding port at the middle rear part of an extruder with resin in a molten state section;

(5) And (3) after the materials are subjected to reactive extrusion in an extruder, water-cooling, bracing and granulating, cooling to room temperature and crystallizing to obtain the target product.

[ example 2 ]

Polyacetal resins were prepared by the method of example 1, except that the preparation of the functionalized polyacetal was not carried out and the polyacetal was adjusted to a commercially available polyacetal, and the raw material selection and the addition parts by mass were different as shown in Table 1.

[ example 3 ]

Polyacetal resins were prepared by the method of example 1, except for the selection of the raw materials and the addition of the parts by mass shown in Table 1.

[ example 4 ]

Polyacetal resins were prepared by the method of example 1, except that the types of raw materials and the parts by mass of the additives shown in Table 1 were different.

[ example 5 ] A method for producing a polycarbonate

[ example 6 ] A method for producing a polycarbonate

Polyacetal resins were prepared by the method of example 2, except that the types of raw materials and the parts by mass of the additives shown in Table 1 were different.

[ example 7 ]

Comparative example 1

(1) Uniformly mixing 100 parts by mass of commercially available polyacetal particles, 0.3 part by mass of antioxidant 245, 0.3 part by mass of nucleating agent, 0.3 part by mass of calcium stearate and 0.3 part by mass of melamine, and putting the mixture into a double-screw extruder for melt mixing;

(2) The screw rotating speed of the double-screw extruder is 200rpm, the front section temperature of the extruder is 170 ℃, the middle section temperature is 200 ℃, the rear section temperature is 180 ℃, the cooling temperature is 25 ℃, and the vacuum degree of each vacuum zone is 5 mbar;

(3) And (3) after the materials are subjected to reactive extrusion in an extruder, carrying out water-cooling bracing and granulating, and cooling to room temperature for crystallization to obtain a target product.

Comparative example 2

(1) Uniformly mixing 100 parts by mass of functionalized polyacetal particles (prepared according to the process in example 1), 0.3 part by mass of antioxidant 245, 0.3 part by mass of nucleating agent, 0.3 part by mass of calcium stearate and 0.3 part by mass of melamine, and putting the mixture into a double-screw extruder for melting and mixing;

(2) NDI with the mass part of 1 part is added from a feeding port at the middle rear part of an extruder with resin in a molten state section;

(3) The screw rotating speed of the double-screw extruder is 200rpm, the front section temperature of the extruder is 170 ℃, the middle section temperature is 200 ℃, the rear section temperature is 180 ℃, the cooling temperature is 25 ℃, and the vacuum degree of each vacuum zone is 5 mbar;

(4) And (3) after the materials are subjected to reactive extrusion in an extruder, water-cooling, bracing and granulating, cooling to room temperature and crystallizing to obtain the target product.

Comparative example 3

(2) Adding 10 parts by mass of EDOT from a feeding port at the middle rear part of an extruder at a section where resin is in a molten state;

(4) And (3) after the materials are subjected to reactive extrusion in an extruder, carrying out water-cooling bracing and granulating, and cooling to room temperature for crystallization to obtain a target product.

TABLE 1 examples and comparative examples raw material selection and addition amount

The polyacetal resins prepared in the examples and comparative examples were tested for various properties, and the results are shown in Table 2:

TABLE 2 results of the Performance test of examples and comparative examples

As can be seen from the results shown in Table 2, the volume resistivity of the polyacetal that has been melt-extruded with the thiophene compound and the diisocyanate-reactive compatibilizer is not only significantly reduced, but preferably 10 ⁸ Omega is in antistatic grade, and the thermal weight loss rate is reduced, which shows that the thermal stability is obviously improved, and the antibacterial agent has good antibacterial effect on escherichia coli and staphylococcus aureus, and shows that the antibacterial property is obviously improved.

In addition, the parameters of the mechanical properties (tensile stress, flexural modulus, impact strength of beam, thermal deformation temperature) of the polyacetal resins prepared in examples 1-7 are equivalent to those of comparative examples 1-3, which shows that the polyacetal resins prepared by the method have good antistatic property and antibacterial property, do not cause great change of the mechanical properties of the resin materials, can still maintain good mechanical properties and thermal stability, and have universal application effect.

In conclusion, the polyacetal resin is modified by adding the thiophene substances, and diisocyanate containing-NCO active groups is taken as the compatilizer, so that the antibacterial property and the antistatic property of the polyacetal resin are effectively improved; in addition, the branched chain with the epoxy group at the tail end is further introduced into the main chain of the polyacetal resin, so that the grafting and crosslinking reaction between the matrix resin and the auxiliary agent is facilitated, the thermal stability of the polyacetal resin is further enhanced, and the antistatic property of the polyacetal resin is enhanced.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.

Claims

1. An antistatic and antibacterial polyacetal resin is characterized by comprising polyacetal, a thiophene compound and a reactive compatilizer; the mass ratio of the polyacetal to the thiophene compound is 2:1 to 100:1; the mass ratio of the thiophene compound to the reactive compatilizer is 2:1 to 100:1;

the thiophene compound is a thiophene compound or a polymer containing epoxy groups;

the reactive compatilizer is diisocyanate;

the polyacetal is a functional acetal with epoxy group-containing branched chains at molecular chain terminals.

2. The antistatic and antibacterial polyacetal resin as claimed in claim 1, wherein the mass ratio of said polyacetal and said thiophene-based compound is 2:1 to 50:1; the mass ratio of the thiophene compound to the reactive compatilizer is 5:1 to 50:1.

3. the antistatic and antibacterial polyacetal resin as claimed in claim 2, wherein the mass ratio of said polyacetal and said thiophene compound is 5:1 to 20:1; the mass ratio of the thiophene compound to the reactive compatilizer is 5:1 to 20:1.

4. the antistatic, antibacterial polyacetal resin as claimed in claim 1, wherein said thiopheneic compound is one or more of poly (3, 4-ethylenedioxythiophene), poly (3, 4-ethylenedioxythiophene)/polystyrenesulfonic acid and 3, 4-ethylenedioxythiophene monomer.

5. The antistatic, antibacterial polyacetal resin as claimed in claim 1, wherein said reactive compatibilizer is one or more selected from the group consisting of 1, 5-naphthalene diisocyanate, hexamethylene diisocyanate trimer, m-xylylene isocyanate, 4' -dicyclohexylmethane diisocyanate and isophorone diisocyanate.

6. The antistatic, antibacterial polyacetal resin according to any one of claims 1 to 5, wherein said functionalized polyacetal has a melt flow rate of 1 to 50g/min at 190 ℃ under a load of 2.16 kg.

7. The antistatic and antibacterial polyacetal resin as claimed in claim 6, wherein said functionalized polyacetal has a melt flow rate of 6 to 27g/min at 190 ℃ under a load of 2.16 kg.

8. The antistatic, antibacterial polyacetal resin according to any one of claims 1 to 5, further comprising an auxiliary; the auxiliary agent is one or more of an antioxidant, a lubricant, a nucleating agent and a formaldehyde catching agent.

9. A method for producing an antistatic, antibacterial polyacetal resin according to any one of claims 1 to 8, comprising the steps of:

1) Mixing polyacetal and assistant uniformly;

10. The method for preparing an antistatic and antibacterial polyacetal resin according to claim 8, wherein the polyacetal is a functionalized polyacetal having a branched chain containing epoxy groups at the molecular chain terminal, and the process for preparing the functionalized polyacetal comprises: mixing a catalyst, a chain transfer agent and a solvent, then blending the mixture with trioxymethylene, dioxolane and pentaerythritol tetraglycidyl ether, and reacting to prepare the functionalized acetal powder: and (3) putting the prepared functional acetal powder into a triethylamine solution, stirring for inactivation, centrifuging, drying, devolatilizing, extruding and granulating to obtain the functional acetal resin.

11. The method for producing an antistatic, antibacterial polyacetal resin according to claim 10, wherein said catalyst is boron trifluoride, a boron trifluoride complex or a heteropoly acid catalyst.

12. The method for producing an antistatic, antibacterial polyacetal resin according to claim 11, wherein said boron trifluoride complex is one or both of boron trifluoride diethyl etherate complex and boron trifluoride n-butyl etherate complex; the heteropoly acid catalyst is one or more of phosphotungstic acid, phosphomolybdic vanadate and phosphotungstic vanadate.

13. The method for preparing an antistatic and antibacterial polyacetal resin according to claim 11, wherein said chain transfer agent is one or more of methylal, acetal and butyral.

14. The method for preparing an antistatic and antibacterial polyacetal resin as claimed in claim 11, wherein the solvent is one or more selected from cyclohexane, n-hexane and n-heptane.

15. The method for producing an antistatic and antibacterial polyacetal resin according to any one of claims 9 to 14, wherein said melt-kneading apparatus is a twin-screw extruder or a twin-shaft reactor, wherein the twin-screw extruder has a length/diameter ratio of not more than 52, the temperature of each zone is 140 to 210 ℃, and the degree of vacuum of each vacuum zone is not more than 50 mbar.